001/** 002 * Copyright 2015 DuraSpace, Inc. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.fcrepo.kernel.impl.rdf.impl; 017 018import com.google.common.collect.Iterators; 019import com.hp.hpl.jena.graph.Triple; 020import com.hp.hpl.jena.rdf.model.Resource; 021import org.fcrepo.kernel.models.FedoraResource; 022import org.fcrepo.kernel.identifiers.IdentifierConverter; 023import org.fcrepo.kernel.impl.rdf.impl.mappings.PropertyToTriple; 024import javax.jcr.Property; 025import javax.jcr.RepositoryException; 026 027import java.util.Iterator; 028 029/** 030 * Accumulate inbound references to a given resource 031 * 032 * @author cabeer 033 */ 034public class ReferencesRdfContext extends NodeRdfContext { 035 036 private final PropertyToTriple property2triple; 037 038 /** 039 * Add the inbound references from other nodes to this resource to the stream 040 * 041 * @param resource the resource 042 * @param idTranslator the id translator 043 * @throws RepositoryException if repository exception occurred 044 */ 045 046 public ReferencesRdfContext(final FedoraResource resource, 047 final IdentifierConverter<Resource, FedoraResource> idTranslator) 048 throws RepositoryException { 049 super(resource, idTranslator); 050 property2triple = new PropertyToTriple(resource.getNode().getSession(), idTranslator); 051 concat(putStrongReferencePropertiesIntoContext()); 052 concat(putWeakReferencePropertiesIntoContext()); 053 } 054 055 private Iterator<Triple> putWeakReferencePropertiesIntoContext() throws RepositoryException { 056 final Iterator<Property> properties = resource().getNode().getWeakReferences(); 057 058 return Iterators.concat(Iterators.transform(properties, property2triple)); 059 } 060 061 private Iterator<Triple> putStrongReferencePropertiesIntoContext() throws RepositoryException { 062 final Iterator<Property> properties = resource().getNode().getReferences(); 063 064 return Iterators.concat(Iterators.transform(properties, property2triple)); 065 066 } 067 068}